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Re: Fluorescent Lights = sleepiness?
something else you can do, power a small fan with a variable power supply, and look through the blades at the fluorescent lights in the room.
If you get the speed just right it looks like the lights are slowly turning on and off. And if different banks of lights are powered on different phases of the power coming into the building (220 or 3 phase power) you can tell which ones are wired together, because they pulse together.
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